package com.gopay.bis.pab.expay.rsa;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.xml.security.Init;
import org.apache.xml.security.signature.XMLSignatureInput;
import org.apache.xml.security.utils.resolver.ResourceResolverException;
import org.apache.xml.security.utils.resolver.ResourceResolverSpi;
import org.apache.xml.utils.URI;
import org.w3c.dom.Attr;

public class OfflineResolver extends ResourceResolverSpi {
	static Log log = LogFactory.getLog(OfflineResolver.class.getName());

	static Map _uriMap = null;

	static Map _mimeMap = null;

	static {
		Init.init();

		_uriMap = new HashMap();
		_mimeMap = new HashMap();

		register("http://www.w3.org/TR/xml-stylesheet",
				"data/org/w3c/www/TR/xml-stylesheet.html", "text/html");
		register("http://www.w3.org/TR/2000/REC-xml-20001006",
				"data/org/w3c/www/TR/2000/REC-xml-20001006", "text/xml");
		register("http://www.nue.et-inf.uni-siegen.de/index.html",
				"data/org/apache/xml/security/temp/nuehomepage", "text/html");
		register("http://www.nue.et-inf.uni-siegen.de/~geuer-pollmann/id2.xml",
				"data/org/apache/xml/security/temp/id2.xml", "text/xml");
		register("http://xmldsig.pothole.com/xml-stylesheet.txt",
				"data/com/pothole/xmldsig/xml-stylesheet.txt", "text/xml");
		register(
				"http://www.w3.org/Signature/2002/04/xml-stylesheet.b64",
				"data/ie/baltimore/merlin-examples/merlin-xmldsig-twenty-three/xml-stylesheet.b64",
				"text/plain");
	}

	public XMLSignatureInput engineResolve(Attr uri, String BaseURI)
			throws ResourceResolverException {
		try {
			String URI = uri.getNodeValue();

			if (_uriMap.containsKey(URI)) {
				String newURI = (String) _uriMap.get(URI);

				log.debug("Mapped " + URI + " to " + newURI);

				InputStream is = new FileInputStream(newURI);

				log.debug("Available bytes = " + is.available());

				XMLSignatureInput result = new XMLSignatureInput(is);

				result.setSourceURI(URI);
				result.setMIMEType((String) _mimeMap.get(URI));

				return result;
			}
			Object[] exArgs = { "The URI " + URI
					+ " is not configured for offline work" };

			throw new ResourceResolverException("generic.EmptyMessage", exArgs,
					uri, BaseURI);
		} catch (IOException ex) {
			throw new ResourceResolverException("generic.EmptyMessage", ex, uri, 
				      BaseURI);
		}
		
	}

	public boolean engineCanResolve(Attr uri, String BaseURI) {
		String uriNodeValue = uri.getNodeValue();

		if ((uriNodeValue.equals("")) || (uriNodeValue.startsWith("#"))) {
			return false;
		}
		try {
			URI uriNew = new URI(new URI(BaseURI), uri.getNodeValue());

			if (uriNew.getScheme().equals("http")) {
				log.debug("I state that I can resolve " + uriNew.toString());

				return true;
			}

			log.debug("I state that I can't resolve " + uriNew.toString());
		} catch (URI.MalformedURIException localMalformedURIException) {
		}
		return false;
	}

	private static void register(String URI, String filename, String MIME) {
		_uriMap.put(URI, filename);
		_mimeMap.put(URI, MIME);
	}
}